fungiclarkb : when I run df -h , it shows mount on /run/media/root/cloudimg-rootfs， run kpartx -d /dev/loop0 also shows device or resource busy, and I run lsof | grep loop0p2 can't find process. follow is different build from before.
```
[root@managesf.sftests.com nodepool]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                  16G     0   16G   0% /dev
tmpfs                     16G  104K   16G   1% /dev/shm
tmpfs                     16G   19M   16G   1% /run
tmpfs                     16G     0   16G   0% /sys/fs/cgroup
/dev/mapper/centos-root  863G   31G  833G   4% /
/dev/sda2               1014M  154M  861M  16% /boot
/dev/sda1                200M   12M  189M   6% /boot/efi
/dev/mapper/centos-home   50G   58M   50G   1% /home
tmpfs                    3.1G   44K  3.1G   1% /run/user/0
/dev/mapper/loop0p2      3.8G  2.0G  1.6G  57% /run/media/root/cloudimg-rootfs

[root@managesf.sftests.com nodepool]# umount /var/cache/nodepool/dib_tmp/dib_build.3DMuQbbI/mnt/
umount: /var/cache/nodepool/dib_tmp/dib_build.3DMuQbbI/mnt/: not mounted
[root@managesf.sftests.com nodepool]# kpartx -d /dev/loop0
device-mapper: remove ioctl on loop0p2  failed: Device or resource busy
```